Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-08-24
1990-02-13
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148120, 148121, H01F 102
Patent
active
049003747
ABSTRACT:
Hot worked, fine grain, permanent magnets of the iron-neodymium-boron type can be demagnetized by heating in air for a period of minutes at a temperature in the range of 100.degree. C. to 300.degree. C. above their Curie temperature without significant loss of coercivity.
REFERENCES:
patent: 4792367 (1988-12-01), Lee
patent: 4802931 (1989-02-01), Croat
General Motors Corporation
Grove George A.
Sheehan John P.
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